When restoring my car I bought numerous batches of FC7 mixed from various paint manufacturers, & laid out test panels of each. All were a different shade. As others have stated DuPont is more on the silver side, PPG is more violet. I found PPG to be a dead-nuts match. Which makes sense because these cars were originally painted in Ditzler, which is now known as PPG.
I also found FJ5 Sublime is also more vibrant in PPG vs DuPont.